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| 小秦岭文峪和娘娘山花岗岩体锆石SHRIMP U-Pb年龄及其意义 | |
| 引用本文： | 王义天,叶会寿,叶安旺,帅云,李永革,张长青.小秦岭文峪和娘娘山花岗岩体锆石SHRIMP U-Pb年龄及其意义[J].地质科学,2010,45(1). |
| 作者姓名： | 王义天 叶会寿 叶安旺 帅云 李永革 张长青 |
| 作者单位： | 1. 中国地质科学院矿产资源研究所,北京,100037;国土资源部成矿作用与资源评价重点实验室,北京,100037 2. 河南省灵宝市地质矿产局,河南灵宝,472500 3. 江西省赣西地质调查大队,江西南昌,330201 |
| 基金项目： | 国家自然科学基金，中国地质大学地质过程与矿产资源国家重点实验室开放基金 |
| 摘 要： | 对小秦岭文峪和娘娘山花岗岩体进行的锆石SHRIMP U-Pb定年和岩石地球化学分析结果表明,文峪和娘娘山黑云母二长花岗岩体属于Ⅰ型花岗岩,是太古宙太华群高级变质岩系经部分熔融的产物。它们的成岩年龄分别为138.4±2.5 Ma和141.7±2.5 Ma,略早于本区拆离伸展活动的时限,暗示了中下地壳部分熔融形成的岩浆热穹窿和花岗质岩浆在上地壳的大面积侵位导致了小秦岭变质核杂岩的发育。花岗岩体的成岩年龄都早于本区金矿床的主期成矿时代,从时间上表明了花岗质岩浆活动与金矿成矿作用无直接关系。 |
| 关 键 词： | 文峪和娘娘山花岗岩体 锆石SHRIMP U-Pb定年 黑云母二长花岗岩 Ⅰ型花岗岩 小秦岭 Ⅰ-type granite |
Zircon SHRIMP U-Pb ages and their significances of the Wenyu and Niangniangshan granitic plutons in the Xiaoqinling area,central China |
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| Wang Yitian,Ye Huishou,Ye Anwang,Shuai Yun,Li Yongge,Zhang Changqing.Zircon SHRIMP U-Pb ages and their significances of the Wenyu and Niangniangshan granitic plutons in the Xiaoqinling area,central China[J].Chinese Journal of Geology,2010,45(1). | |
| Authors: | Wang Yitian Ye Huishou Ye Anwang Shuai Yun Li Yongge Zhang Changqing |
| Abstract: | The zircon SHRIMP U-Pb dating and petrochemistry study on the Wenyu and Niangniangshan granitic plutons in the Xiaoqinling area,central China,have been carried out in this paper.The results indicate that the Wenyu and Niangniangshan biotite monzogranites belong to the I-type granite,which are the products of partial melting of high-grade metamorphic rocks of the Archean Taihua Group.and their ages are of 138.4±2.5 Ma and 141.7±2.5 Ma respectively.The age data are slightly older than the time of detachment extension in this area,implying that the Xiaoqinling metamorphic core complex is resulted from the formation of magma thermal dome within middle-lower crust,and the upwelling and emplacement of granitic magma within upper crust.The age data are also older than the gold ore-forming time,showing there is no direct relationship between the granitic magmatism and large-scale gold mineralization in the Xiaoqinling area. |
| Keywords: | Wenyu and Niangniangshan granitic plutons Zircon SHRIMP U-Pb age Biotite monzogranite Xiaoqinling area |
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